High magnetic field phase diagram of PrOs4Sb12

Details High magnetic field phase diagram of PrOs4Sb12 High magnetic field phase diagram of PrOs4Sb12

2003-05-08

arxiv.org/abs/cond-mat/0305182v3

Physics

Condensed Matter

Strongly Correlated Electrons

Submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.92.037203

The magnetic phase diagram of PrOs$_4$Sb$_{12}$ has been investigated by specific heat measurements between 8 and 32 T. A new Schottky anomaly due to excitations between two lowest crystalline-electric-field (CEF) singlets, has been found for both $H \parallel (100)$ and $H \parallel (110)$ above the field where the field-induced ordered phase (FIOP) is suppressed. The constructed $H-T$ phase diagram shows weak magnetic anisotropy and implies a crossing of the two CEF levels at about 8 - 9 T for both field directions. These results provide an unambiguous evidence for the $\Gamma_1$ singlet being the CEF ground state and suggest the level crossing (involving lowest CEF levels) as the driving mechanism of FIOP.

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